theme should not be indented
diff --git a/pelicanconf.yaml b/pelicanconf.yaml
index 882fcc7..8c3df41 100644
--- a/pelicanconf.yaml
+++ b/pelicanconf.yaml
@@ -5,7 +5,8 @@
   logo: images/logo.png
   repository: https://github.com/apache/petri/blob/master/content/pages/
   trademarks: Apache, the Apache feather logo, and Petri are trademarks or registered trademarks
-  theme: theme/apache
+
+theme: theme/apache
 
 plugins:
   paths: